Adjustable lathe template

Abstract

An adjustable template for a lathe has a pair of pivotable arms extending from a circular or partially circular center post which are disposed so that the edge of each arm lies tangential to the circumference forming a pattern for the stylus of the automatic feed to trace whereby the cutting tool machines two angles with respect to the center line and a radius therebetween in the workpiece. Adjustment of the arms determines the angles and the diameter of the stylus determines the radius.

We claim: 
     
       1. An adjustable template for controlling an automatic feed of a lathe to position its cutting tool so as to cut into the workpiece two angles and an interconnecting radius, said template including a flat base member, upstanding member having at least a partially circumferential edge, a pair of bar members rotatably supported to said base member and having a straight working edge that lies tangential to said partially circumferential edge, all of said edges defining the pattern cut by the cutting tool of said lathe which pattern includes a first and second angle and an interconnecting radius, means for tracing said pattern including a stylus following said edges, and retractable means for securing each of said bar members once the preselected first and second angles have been adjusted. 
     
     
       2. An adjustable template as claimed in claim 1 wherein said stylus includes a replaceable follower the size of said follower being related to the dimension of said radius. 
     
     
       3. An adjustable template designed to serve as a pattern for a stylus to follow for an automatic feed lathe for cutting two angles and an interconnecting radius in the workpiece, said template including a flat base member, a rotatable disc supported to said flat base member, an upstanding arcuate shaped member having an arcuate inner surface carried by said rotatable disc, a pair of arms movable relative to said flat base plate and said rotatable disc supported to said flat base member and said rotatable disc, each of said arms having a straight edge surface adapted to lie tangentially to said arcuate inner surface, means for securing said arms to said flat base plate and said rotatable disc independently of each other, whereby said disc can be rotated so that one of said arms lies tangential to said arcuate inner surface during one portion of the cutting operation and said other arm lies tangential to said inner arcuate surface during the other portion of the cutting operation by rotating said rotatable disc while the arms are secured to said flat base member. 
     
     
       4. An adjustable template as claimed in claim 3 including concentric slots in said flat base member and said rotatable disc, and depending members in said arms fitted into said slots to be supported and aligned thereby relative to said arcuate surface. 
     
     
       5. An adjustable template as claimed in claim 3 including a scale on said flat base member and an indicator on each of said arms bearing a relation to said workpiece so that each arm is set to the angle desired on the workpiece. 
     
     
       6. A universal template for positioning the cutting tool positioned by an automatic feed of a lathe so as to cut into the workpiece two angles and an interconnecting radius, said template including a flat base member, an upstanding central circumferential member having a circumferential edge, a pair of bar members rotatably supported to said base member having an axis common to said circumferential edge and having a straight working edge that lies tangential to said circumferential edge, all of said edges defining the pattern cut by the cutting tool of said lathe which pattern includes a first angle, a joining radius, and a second angle, means for tracing said pattern including a stylus following said edges, and retractable means for securing each of said bar members once the preselected angles have been adjusted. 
     
     
       7. A universal template as claimed in claim 6 wherein said central member is stepped for defining at least two circumferential edges, said bar members also stepped so that each step lies coplanar with a corresponding step of said central member, and the dimension of said step bearing a given relationship to the desired size of said workpiece. 
     
     
       8. A universal template as claimed in claim 7 including concentric grooves coaxially mounted with respect to the axis of said central member, and means on said bar members slidable in said grooves, and means for securing said bar members into a fixed position. 
     
     
       9. A universal template as claimed in claim 6 including a gauge carried by each of said bar members having a given relationship to said flat base member and the workpiece to set the angles of the sides of the pieces to be cut.